use crate::error::TauriCommandError;
use crate::types::{GraphData, GraphMetadata, GraphNodeData, GraphEdgeData, FileChange, ChangeType, GraphQuery, QueryResult};
use crate::services::progress::PROGRESS_MANAGER;
use std::collections::HashMap;
use dashmap::DashMap;
use std::sync::Arc;

/// 模拟的 CodeGraph 结构（等待实际实现）
#[derive(Debug, Clone)]
pub struct MockCodeGraph {
    pub id: String,
    pub created_at: chrono::DateTime<chrono::Utc>,
}

impl MockCodeGraph {
    pub fn new() -> Self {
        Self {
            id: uuid::Uuid::new_v4().to_string(),
            created_at: chrono::Utc::now(),
        }
    }
}

/// CodeGraph 服务
pub struct CodeGraphService {
    graphs: Arc<DashMap<String, Arc<MockCodeGraph>>>,
}

impl CodeGraphService {
    /// 创建新的 CodeGraph 服务实例
    pub fn new() -> Self {
        Self {
            graphs: Arc::new(DashMap::new()),
        }
    }
    
    /// 初始化代码图谱
    pub async fn initialize(workspace: &str, operation_id: &str) -> Result<String, TauriCommandError> {
        log::info!("Initializing CodeGraph for workspace: {}", workspace);
        
        // 生成图谱ID
        let graph_id = uuid::Uuid::new_v4().to_string();
        
        // 报告进度
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 10, 100, "创建图谱实例".to_string());
        
        // 创建新的代码图谱
        let graph = MockCodeGraph::new();
        
        // 报告进度
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 30, 100, "扫描工作区文件".to_string());
        
        // 扫描工作区并解析文件
        Self::scan_and_parse_workspace(&graph, workspace, operation_id).await?;
        
        // 报告进度
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 80, 100, "构建关系图".to_string());
        
        // 构建关系
        Self::build_relationships(&graph, operation_id).await?;
        
        // 存储图谱
        GRAPH_SERVICE.graphs.insert(graph_id.clone(), Arc::new(graph));
        
        // 报告完成
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 100, 100, "初始化完成".to_string());
        
        log::info!("CodeGraph initialized successfully: {}", graph_id);
        Ok(graph_id)
    }
    
    /// 获取图谱数据
    pub async fn get_graph_data(graph_id: &str) -> Result<GraphData, TauriCommandError> {
        let graph = GRAPH_SERVICE.graphs.get(graph_id)
            .ok_or_else(|| TauriCommandError::codegraph("图谱不存在"))?;
        
        // 转换图谱数据为前端格式
        let nodes = Self::convert_nodes(&graph).await?;
        let edges = Self::convert_edges(&graph).await?;
        let metadata = Self::get_metadata(&graph).await?;
        
        Ok(GraphData {
            nodes,
            edges,
            metadata,
        })
    }
    
    /// 增量更新图谱
    pub async fn update_incremental(changes: Vec<FileChange>, operation_id: &str) -> Result<String, TauriCommandError> {
        let total_changes = changes.len() as u64;
        let mut processed = 0u64;
        
        for change in changes {
            processed += 1;
            let progress_msg = format!("处理文件变更: {}", change.path);
            let _ = PROGRESS_MANAGER.update_progress(operation_id, processed, total_changes, progress_msg);
            
            match change.change_type {
                ChangeType::Created | ChangeType::Modified => {
                    if let Some(content) = change.content {
                        Self::process_file_change(&change.path, &content).await?;
                    }
                }
                ChangeType::Deleted => {
                    Self::process_file_deletion(&change.path).await?;
                }
                ChangeType::Renamed { old_path } => {
                    Self::process_file_rename(&old_path, &change.path).await?;
                }
            }
        }
        
        Ok(format!("成功处理 {} 个文件变更", total_changes))
    }
    
    /// 查询图谱
    pub async fn query_graph(query: GraphQuery) -> Result<QueryResult, TauriCommandError> {
        // 这里应该实现实际的图谱查询逻辑
        // 目前返回一个模拟的结果
        Ok(QueryResult {
            nodes: Vec::new(),
            edges: Vec::new(),
            total_count: 0,
            query_time_ms: 0,
        })
    }
    
    /// 获取图谱统计信息
    pub async fn get_graph_stats(graph_id: &str) -> Result<GraphMetadata, TauriCommandError> {
        let graph = GRAPH_SERVICE.graphs.get(graph_id)
            .ok_or_else(|| TauriCommandError::codegraph("图谱不存在"))?;
        
        Self::get_metadata(&graph).await
    }
    
    /// 导出图谱
    pub async fn export_graph(graph_id: &str, format: &str, output_path: &str, operation_id: &str) -> Result<String, TauriCommandError> {
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 0, 100, "开始导出".to_string());
        
        let graph = GRAPH_SERVICE.graphs.get(graph_id)
            .ok_or_else(|| TauriCommandError::codegraph("图谱不存在"))?;
        
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 50, 100, "序列化数据".to_string());
        
        // 根据格式导出
        match format.to_lowercase().as_str() {
            "json" => Self::export_as_json(&graph, output_path).await?,
            "graphml" => Self::export_as_graphml(&graph, output_path).await?,
            "dot" => Self::export_as_dot(&graph, output_path).await?,
            _ => return Err(TauriCommandError::validation("不支持的导出格式")),
        }
        
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 100, 100, "导出完成".to_string());
        
        Ok(output_path.to_string())
    }
    
    /// 清理缓存
    pub async fn cleanup_cache() -> Result<String, TauriCommandError> {
        // 实现缓存清理逻辑
        Ok("缓存清理完成".to_string())
    }
    
    /// 重建图谱
    pub async fn rebuild(workspace: &str, operation_id: &str) -> Result<String, TauriCommandError> {
        // 清理现有图谱
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 0, 100, "清理现有图谱".to_string());
        
        // 重新初始化
        Self::initialize(workspace, operation_id).await
    }
    
    /// 获取健康状态
    pub async fn get_health_status(graph_id: &str) -> Result<serde_json::Value, TauriCommandError> {
        let graph = GRAPH_SERVICE.graphs.get(graph_id)
            .ok_or_else(|| TauriCommandError::codegraph("图谱不存在"))?;
        
        let health = serde_json::json!({
            "status": "healthy",
            "last_updated": chrono::Utc::now(),
            "node_count": 0, // 实际应该从图谱获取
            "edge_count": 0, // 实际应该从图谱获取
            "memory_usage": "unknown",
            "performance_metrics": {
                "avg_query_time": 0.0,
                "cache_hit_rate": 0.0
            }
        });
        
        Ok(health)
    }
    
    // 私有辅助方法
    
    async fn scan_and_parse_workspace(
        graph: &MockCodeGraph,
        workspace: &str,
        operation_id: &str
    ) -> Result<(), TauriCommandError> {
        // 实现工作区扫描和解析逻辑
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 50, 100, "解析源代码文件".to_string());
        log::debug!("Scanning workspace: {} for graph: {}", workspace, graph.id);
        Ok(())
    }

    async fn build_relationships(
        graph: &MockCodeGraph,
        operation_id: &str
    ) -> Result<(), TauriCommandError> {
        // 实现关系构建逻辑
        let _ = PROGRESS_MANAGER.update_progress(operation_id, 70, 100, "分析代码关系".to_string());
        log::debug!("Building relationships for graph: {}", graph.id);
        Ok(())
    }

    async fn convert_nodes(graph: &MockCodeGraph) -> Result<Vec<GraphNodeData>, TauriCommandError> {
        // 转换节点数据
        log::debug!("Converting nodes for graph: {}", graph.id);
        Ok(Vec::new())
    }

    async fn convert_edges(graph: &MockCodeGraph) -> Result<Vec<GraphEdgeData>, TauriCommandError> {
        // 转换边数据
        log::debug!("Converting edges for graph: {}", graph.id);
        Ok(Vec::new())
    }

    async fn get_metadata(graph: &MockCodeGraph) -> Result<GraphMetadata, TauriCommandError> {
        // 获取图谱元数据
        log::debug!("Getting metadata for graph: {}", graph.id);
        Ok(GraphMetadata {
            created_at: graph.created_at,
            modified_at: chrono::Utc::now(),
            version: 1,
            node_count: 0,
            edge_count: 0,
            languages: Vec::new(),
            node_types: Vec::new(),
            edge_types: Vec::new(),
        })
    }
    
    async fn process_file_change(path: &str, content: &str) -> Result<(), TauriCommandError> {
        // 处理文件变更
        log::debug!("Processing file change: {}", path);
        Ok(())
    }
    
    async fn process_file_deletion(path: &str) -> Result<(), TauriCommandError> {
        // 处理文件删除
        log::debug!("Processing file deletion: {}", path);
        Ok(())
    }
    
    async fn process_file_rename(old_path: &str, new_path: &str) -> Result<(), TauriCommandError> {
        // 处理文件重命名
        log::debug!("Processing file rename: {} -> {}", old_path, new_path);
        Ok(())
    }
    
    async fn export_as_json(graph: &MockCodeGraph, output_path: &str) -> Result<(), TauriCommandError> {
        // 导出为 JSON 格式
        log::debug!("Exporting graph {} as JSON to: {}", graph.id, output_path);
        Ok(())
    }

    async fn export_as_graphml(graph: &MockCodeGraph, output_path: &str) -> Result<(), TauriCommandError> {
        // 导出为 GraphML 格式
        log::debug!("Exporting graph {} as GraphML to: {}", graph.id, output_path);
        Ok(())
    }

    async fn export_as_dot(graph: &MockCodeGraph, output_path: &str) -> Result<(), TauriCommandError> {
        // 导出为 DOT 格式
        log::debug!("Exporting graph {} as DOT to: {}", graph.id, output_path);
        Ok(())
    }
}

impl Default for CodeGraphService {
    fn default() -> Self {
        Self::new()
    }
}

// 全局 CodeGraph 服务实例
lazy_static::lazy_static! {
    pub static ref GRAPH_SERVICE: CodeGraphService = CodeGraphService::new();
}
